These are overload load leveler helper springs for the rear axel. I have had these a long time and did not use them. I believe I took them off from Chevy truck but not really sure, probably 67-72 or 79-87 squarebody. I don't remember the year but I have included the measurements. Total length 32 1/2", width 2 1/4". Leaf spring bracket end to end measures 5". Leaf spring bracket center to center bolt measures 3 1/2". Leaf spring width measures 1 3/4". This is heavy metal.